Coated Material

Abstract

A coated material for a cutting tool can realize long life-time under severe cutting processing conditions such as high-speed processing, high-feed-rate processing, higher hardness of a material to be cut, cutting of a difficult-to-cut material, etc. In a coated material in which a coating is coated on the surface of a substrate, at least one layer of the coating is a hard film having a cubic metallic compound which includes at least one metal element M selected from Al, Si, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, and at least one element selected from C, N and O. An X-ray intensity distribution of an α axis in a pole figure for a (111) plane of the hard film has a maximum intensity in an α angle range of 75 to 90°, and an X-ray intensity distribution of an α axis in a pole figure for a (220) plane of the hard film has a maximum intensity in an α angle range of 75 to 90°.

1 . A coated material comprising a coating coated on a surface of a substrate, wherein:
 at least one layer of the coating is a hard film comprising a cubic metallic compound,   an X-ray intensity distribution of an α axis in a pole figure for a (111) plane of the hard film has a maximum intensity in an α angle range of 75 to 90°, and   an X-ray intensity distribution of an α axis in a pole figure for a (220) plane of the hard film has a maximum intensity in an α angle range of 75 to 90°.   
     
     
         2 . The coated material according to  claim 1 , wherein the hard film is a metallic compound comprising at least one element selected from the group consisting of Al, Si, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, and at least one element selected from the group consisting of C, N and O. 
     
     
         3 . The coated material according to  claim 2 , wherein the hard film comprises two or more elements selected from the group consisting of Al, Si, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W. 
     
     
         4 . The coated material according to  claim 1 , wherein an average thickness of the coating is 0.1 to 15 μm. 
     
     
         5 . The coated material according to  claim 1 , wherein the hard film comprises alternately laminated film in which two or more thin films having different compositions and each having a thickness of 1 to 100 nm are alternately laminated. 
     
     
         6 . A coated cutting tool comprising the coated material according to  claim 1 . 
     
     
         7 . A process for preparing a coated material having at least one hard film layer comprising a cubic metallic compound coated on a surface of a substrate, the process comprising:
 (a) a step of charging a substrate in a coating device, and heating the substrate to a temperature of 400 to 650° C.,   (b) a preliminary discharge step of, after subjecting an Ar gas bombardment to a surface of the substrate, carrying out discharge at a predetermined voltage and current of a direct current bias voltage of the substrate: −600 to −1000V, an arc discharge current: 100 to 150A for 1 to 5 minutes,   (c) a first discharge step of subjecting to an arc discharge by gradually lowering the direct current bias voltage of the substrate at a predetermined voltage of −600 to −1000V to a predetermined voltage of −80 to −180V over 1 to 5 minutes while maintaining the arc discharge current and the temperature of the substrate, and   (d) a second discharge step of subjecting to an arc discharge at the substrate bias voltage: −80 to −180V for a predetermined time while maintaining the arc discharge current and the temperature of the substrate, to obtain the hard film with a desired film thickness.   
     
     
         8 . The coated material according to  claim 2 , wherein an average thickness of the coating is 0.1 to 15 μm. 
     
     
         9 . The coated material according to  claim 3 , wherein an average thickness of the coating is 0.1 to 15 μm. 
     
     
         10 . The coated material according to  claim 2 , wherein the hard film comprises alternately laminated film in which two or more thin films having different compositions and each having a thickness of 1 to 100 nm are alternately laminated. 
     
     
         11 . The coated material according to  claim 3 , wherein the hard film comprises alternately laminated film in which two or more thin films having different compositions and each having a thickness of 1 to 100 nm are alternately laminated. 
     
     
         12 . The coated material according to  claim 4 , wherein the hard film comprises alternately laminated film in which two or more thin films having different compositions and each having a thickness of 1 to 100 nm are alternately laminated. 
     
     
         13 . The coated material according to  claim 8 , wherein the hard film comprises alternately laminated film in which two or more thin films having different compositions and each having a thickness of 1 to 100 nm are alternately laminated. 
     
     
         14 . The coated material according to  claim 9 , wherein the hard film comprises alternately laminated film in which two or more thin films having different compositions and each having a thickness of 1 to 100 nm are alternately laminated.